<?php

/**
 * @file
 * Administration functions for locale.module.
 */

/**
 * @defgroup locale-language-administration Language administration interface
 * @{
 * Administration interface for languages.
 *
 * These functions provide the user interface to show, add, edit and
 * delete languages as well as providing options for language negotiation.
 */

/**
 * User interface for the language overview screen.
 */
function locale_languages_overview_form() {
	drupal_static_reset('language');
	$languages = language_list('language');

	$options = array();
	$form['weight'] = array('#tree' => TRUE);
	foreach ($languages as $langcode => $language) {

		$options[$langcode] = '';
		if ($language->enabled) {
			$enabled[] = $langcode;
		}
		$form['weight'][$langcode] = array(
				'#type' => 'weight',
				'#title' => t('Weight for @title', array('@title' => $language->name)),
				'#title_display' => 'invisible',
				'#default_value' => $language->weight,
				'#attributes' => array('class' => array('language-order-weight')),
		);
		$form['name'][$langcode] = array('#markup' => check_plain($language->name));
		$form['native'][$langcode] = array('#markup' => check_plain($language->native));
		$form['direction'][$langcode] = array('#markup' => ($language->direction == LANGUAGE_RTL ? t('Right to left') : t('Left to right')));
	}
	$form['enabled'] = array(
			'#type' => 'checkboxes',
			'#title' => t('Enabled languages'),
			'#title_display' => 'invisible',
			'#options' => $options,
			'#default_value' => $enabled,
	);
	$form['site_default'] = array(
			'#type' => 'radios',
			'#title' => t('Default language'),
			'#title_display' => 'invisible',
			'#options' => $options,
			'#default_value' => language_default('language'),
	);
	$form['actions'] = array('#type' => 'actions');
	$form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Save configuration'));
	$form['#theme'] = 'locale_languages_overview_form';

	return $form;
}

/**
 * Returns HTML for the language overview form.
 *
 * @param $variables
 *   An associative array containing:
 *   - form: A render element representing the form.
 *
 * @ingroup themeable
 */
function theme_locale_languages_overview_form($variables) {
	$form = $variables['form'];
	$default = language_default();
	foreach ($form['name'] as $key => $element) {
		// Do not take form control structures.
		if (is_array($element) && element_child($key)) {
			// Disable checkbox for the default language, because it cannot be disabled.
			if ($key == $default->language) {
				$form['enabled'][$key]['#attributes']['disabled'] = 'disabled';
			}

			// Add invisible labels for the checkboxes and radio buttons in the table
			// for accessibility. These changes are only required and valid when the
			// form is themed as a table, so it would be wrong to perform them in the
			// form constructor.
			$title = drupal_render($form['name'][$key]);
			$form['enabled'][$key]['#title'] = t('Enable !title', array('!title' => $title));
			$form['enabled'][$key]['#title_display'] = 'invisible';
			$form['site_default'][$key]['#title'] = t('Set !title as default', array('!title' => $title));
			$form['site_default'][$key]['#title_display'] = 'invisible';
			$rows[] = array(
					'data' => array(
							'<strong>' . $title . '</strong>',
							drupal_render($form['native'][$key]),
							check_plain($key),
							drupal_render($form['direction'][$key]),
							array('data' => drupal_render($form['enabled'][$key]), 'align' => 'center'),
							drupal_render($form['site_default'][$key]),
							drupal_render($form['weight'][$key]),
							l(t('edit'), 'admin/config/regional/language/edit/' . $key) . (($key != 'en' && $key != $default->language) ? ' ' . l(t('delete'), 'admin/config/regional/language/delete/' . $key) : '')
					),
					'class' => array('draggable'),
			);
		}
	}
	$header = array(array('data' => t('English name')), array('data' => t('Native name')), array('data' => t('Code')), array('data' => t('Direction')), array('data' => t('Enabled')), array('data' => t('Default')), array('data' => t('Weight')), array('data' => t('Operations')));
	$output = theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => array('id' => 'language-order')));
	$output .= drupal_render_children($form);

	drupal_add_tabledrag('language-order', 'order', 'sibling', 'language-order-weight');

	return $output;
}

/**
 * Process language overview form submissions, updating existing languages.
 */
function locale_languages_overview_form_submit($form, &$form_state) {
	$languages = language_list();
	$default = language_default();
	$url_prefixes = variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX) == LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX;
	$enabled_count = 0;

	foreach ($languages as $langcode => $language) {
		if ($form_state['values']['site_default'] == $langcode || $default->language == $langcode) {
			// Automatically enable the default language and the language
			// which was default previously (because we will not get the
			// value from that disabled checkbox).
			$form_state['values']['enabled'][$langcode] = 1;
		}

		// If language URL prefixes are enabled we must clear language domains and
		// assign a valid prefix to each non-default language.
		if ($url_prefixes) {
			$language->domain = '';
			if (empty($language->prefix) && $form_state['values']['site_default'] != $langcode) {
				$language->prefix = $langcode;
			}
		}

		if ($form_state['values']['enabled'][$langcode]) {
			$enabled_count++;
			$language->enabled = 1;
		}
		else {
			$language->enabled = 0;
		}

		$language->weight = $form_state['values']['weight'][$langcode];

		db_update('languages')
		->fields(array(
				'enabled' => $language->enabled,
				'weight' => $language->weight,
				'prefix' => $language->prefix,
				'domain' => $language->domain,
		))
		->condition('language', $langcode)
		->execute();

		$languages[$langcode] = $language;
	}

	variable_set('language_default', $languages[$form_state['values']['site_default']]);
	variable_set('language_count', $enabled_count);
	drupal_set_message(t('Configuration saved.'));

	// Changing the language settings impacts the interface.
	cache_clear_all('*', 'cache_page', TRUE);
	module_invoke_all('multilingual_settings_changed');

	$form_state['redirect'] = 'admin/config/regional/language';
	return;
}

/**
 * User interface for the language addition screen.
 */
function locale_languages_add_screen() {
	$build['predefined'] = drupal_get_form('locale_languages_predefined_form');
	$build['custom'] = drupal_get_form('locale_languages_custom_form');
	return $build;
}

/**
 * Predefined language setup form.
 */
function locale_languages_predefined_form($form) {
	$predefined = _locale_prepare_predefined_list();
	$form['language list'] = array('#type' => 'fieldset',
			'#title' => t('Predefined language'),
			'#collapsible' => TRUE,
	);
	$form['language list']['langcode'] = array('#type' => 'select',
			'#title' => t('Language name'),
			'#default_value' => key($predefined),
			'#options' => $predefined,
			'#description' => t('Use the <em>Custom language</em> section below if your desired language does not appear in this list.'),
	);
	$form['language list']['actions'] = array('#type' => 'actions');
	$form['language list']['actions']['submit'] = array('#type' => 'submit', '#value' => t('Add language'));
	return $form;
}

/**
 * Custom language addition form.
 */
function locale_languages_custom_form($form) {
	$form['custom language'] = array('#type' => 'fieldset',
			'#title' => t('Custom language'),
			'#collapsible' => TRUE,
			'#collapsed' => TRUE,
	);
	_locale_languages_common_controls($form['custom language']);
	$form['custom language']['actions'] = array('#type' => 'actions');
	$form['custom language']['actions']['submit'] = array(
			'#type' => 'submit',
			'#value' => t('Add custom language')
	);
	// Reuse the validation and submit functions of the predefined language setup form.
	$form['#submit'][] = 'locale_languages_predefined_form_submit';
	$form['#validate'][] = 'locale_languages_predefined_form_validate';
	return $form;
}

/**
 * Editing screen for a particular language.
 *
 * @param $langcode
 *   Language code of the language to edit.
 */
function locale_languages_edit_form($form, &$form_state, $langcode) {
	if ($language = db_query("SELECT * FROM {languages} WHERE language = :language", array(':language' => $langcode))->fetchObject()) {
		_locale_languages_common_controls($form, $language);
		$form['actions'] = array('#type' => 'actions');
		$form['actions']['submit'] = array(
				'#type' => 'submit',
				'#value' => t('Save language')
		);
		$form['#submit'][] = 'locale_languages_edit_form_submit';
		$form['#validate'][] = 'locale_languages_edit_form_validate';
		return $form;
	}
	else {
		drupal_not_found();
		drupal_exit();
	}
}

/**
 * Common elements of the language addition and editing form.
 *
 * @param $form
 *   A parent form item (or empty array) to add items below.
 * @param $language
 *   Language object to edit.
 */
function _locale_languages_common_controls(&$form, $language = NULL) {
	if (!is_object($language)) {
		$language = new stdClass();
	}
	if (isset($language->language)) {
		$form['langcode_view'] = array(
				'#type' => 'item',
				'#title' => t('Language code'),
				'#markup' => $language->language
		);
		$form['langcode'] = array(
				'#type' => 'value',
				'#value' => $language->language
		);
	}
	else {
		$form['langcode'] = array('#type' => 'textfield',
				'#title' => t('Language code'),
				'#size' => 12,
				'#maxlength' => 60,
				'#required' => TRUE,
				'#default_value' => @$language->language,
				'#disabled' => (isset($language->language)),
				'#description' => t('<a href="@rfc4646">RFC 4646</a> compliant language identifier. Language codes typically use a country code, and optionally, a script or regional variant name. <em>Examples: "en", "en-US" and "zh-Hant".</em>', array('@rfc4646' => 'http://www.ietf.org/rfc/rfc4646.txt')),
		);
	}
	$form['name'] = array('#type' => 'textfield',
			'#title' => t('Language name in English'),
			'#maxlength' => 64,
			'#default_value' => @$language->name,
			'#required' => TRUE,
			'#description' => t('Name of the language in English. Will be available for translation in all languages.'),
	);
	$form['native'] = array('#type' => 'textfield',
			'#title' => t('Native language name'),
			'#maxlength' => 64,
			'#default_value' => @$language->native,
			'#required' => TRUE,
			'#description' => t('Name of the language in the language being added.'),
	);
	$form['prefix'] = array('#type' => 'textfield',
			'#title' => t('Path prefix language code'),
			'#maxlength' => 64,
			'#default_value' => @$language->prefix,
			'#description' => t('Language code or other custom text to use as a path prefix for URL language detection, if your <em>Detection and selection</em> settings use URL path prefixes. For the default language, this value may be left blank. <strong>Modifying this value may break existing URLs. Use with caution in a production environment.</strong> Example: Specifying "deutsch" as the path prefix code for German results in URLs like "example.com/deutsch/contact".')
	);
	$form['domain'] = array('#type' => 'textfield',
			'#title' => t('Language domain'),
			'#maxlength' => 128,
			'#default_value' => @$language->domain,
			'#description' => t('The domain name to use for this language if URL domains are used for <em>Detection and selection</em>. Leave blank for the default language. <strong>Changing this value may break existing URLs.</strong> Example: Specifying "de.example.com" as language domain for German will result in an URL like "http://de.example.com/contact".'),
	);
	$form['direction'] = array('#type' => 'radios',
			'#title' => t('Direction'),
			'#required' => TRUE,
			'#description' => t('Direction that text in this language is presented.'),
			'#default_value' => @$language->direction,
			'#options' => array(LANGUAGE_LTR => t('Left to right'), LANGUAGE_RTL => t('Right to left'))
	);
	return $form;
}

/**
 * Validate the language addition form.
 */
function locale_languages_predefined_form_validate($form, &$form_state) {
	$langcode = $form_state['values']['langcode'];

	if (($duplicate = db_query("SELECT COUNT(*) FROM {languages} WHERE language = :language", array(':language' => $langcode))->fetchField()) != 0) {
		form_set_error('langcode', t('The language %language (%code) already exists.', array('%language' => $form_state['values']['name'], '%code' => $langcode)));
	}

	if (!isset($form_state['values']['name'])) {
		// Predefined language selection.
		include_once DRUPAL_ROOT . '/includes/iso.inc';
		$predefined = _locale_get_predefined_list();
		if (!isset($predefined[$langcode])) {
			form_set_error('langcode', t('Invalid language code.'));
		}
	}
	else {
		// Reuse the editing form validation routine if we add a custom language.
		locale_languages_edit_form_validate($form, $form_state);
	}
}

/**
 * Process the language addition form submission.
 */
function locale_languages_predefined_form_submit($form, &$form_state) {
	$langcode = $form_state['values']['langcode'];
	if (isset($form_state['values']['name'])) {
		// Custom language form.
		locale_add_language($langcode, $form_state['values']['name'], $form_state['values']['native'], $form_state['values']['direction'], $form_state['values']['domain'], $form_state['values']['prefix']);
		drupal_set_message(t('The language %language has been created and can now be used. More information is available on the <a href="@locale-help">help screen</a>.', array('%language' => t($form_state['values']['name']), '@locale-help' => url('admin/help/locale'))));
	}
	else {
		// Predefined language selection.
		include_once DRUPAL_ROOT . '/includes/iso.inc';
		$predefined = _locale_get_predefined_list();
		locale_add_language($langcode);
		drupal_set_message(t('The language %language has been created and can now be used. More information is available on the <a href="@locale-help">help screen</a>.', array('%language' => t($predefined[$langcode][0]), '@locale-help' => url('admin/help/locale'))));
	}

	// See if we have language files to import for the newly added
	// language, collect and import them.
	if ($batch = locale_batch_by_language($langcode, '_locale_batch_language_finished')) {
		batch_set($batch);
	}

	$form_state['redirect'] = 'admin/config/regional/language';
}

/**
 * Validate the language editing form. Reused for custom language addition too.
 */
function locale_languages_edit_form_validate($form, &$form_state) {
	// Ensure sane field values for langcode, name, and native.
	if (!isset($form['langcode_view']) && preg_match('@[^a-zA-Z_-]@', $form_state['values']['langcode'])) {
		form_set_error('langcode', t('%field may only contain characters a-z, underscores, or hyphens.', array('%field' => $form['langcode']['#title'])));
	}
	if ($form_state['values']['name'] != check_plain($form_state['values']['name'])) {
		form_set_error('name', t('%field cannot contain any markup.', array('%field' => $form['name']['#title'])));
	}
	if ($form_state['values']['native'] != check_plain($form_state['values']['native'])) {
		form_set_error('native', t('%field cannot contain any markup.', array('%field' => $form['native']['#title'])));
	}

	if (!empty($form_state['values']['domain']) && !empty($form_state['values']['prefix'])) {
		form_set_error('prefix', t('Domain and path prefix values should not be set at the same time.'));
	}
	if (!empty($form_state['values']['domain']) && $duplicate = db_query("SELECT language FROM {languages} WHERE domain = :domain AND language <> :language", array(':domain' => $form_state['values']['domain'], ':language' => $form_state['values']['langcode']))->fetchField()) {
		form_set_error('domain', t('The domain (%domain) is already tied to a language (%language).', array('%domain' => $form_state['values']['domain'], '%language' => $duplicate->language)));
	}
	if (empty($form_state['values']['prefix']) && language_default('language') != $form_state['values']['langcode'] && empty($form_state['values']['domain'])) {
		form_set_error('prefix', t('Only the default language can have both the domain and prefix empty.'));
	}
	if (!empty($form_state['values']['prefix']) && $duplicate = db_query("SELECT language FROM {languages} WHERE prefix = :prefix AND language <> :language", array(':prefix' => $form_state['values']['prefix'], ':language' => $form_state['values']['langcode']))->fetchField()) {
		form_set_error('prefix', t('The prefix (%prefix) is already tied to a language (%language).', array('%prefix' => $form_state['values']['prefix'], '%language' => $duplicate->language)));
	}
}

/**
 * Process the language editing form submission.
 */
function locale_languages_edit_form_submit($form, &$form_state) {
	db_update('languages')
	->fields(array(
			'name' => $form_state['values']['name'],
			'native' => $form_state['values']['native'],
			'domain' => $form_state['values']['domain'],
			'prefix' => $form_state['values']['prefix'],
			'direction' => $form_state['values']['direction'],
	))
	->condition('language',  $form_state['values']['langcode'])
	->execute();
	$default = language_default();
	if ($default->language == $form_state['values']['langcode']) {
		$properties = array('name', 'native', 'direction', 'enabled', 'plurals', 'formula', 'domain', 'prefix', 'weight');
		foreach ($properties as $keyname) {
			if (isset($form_state['values'][$keyname])) {
				$default->$keyname = $form_state['values'][$keyname];
			}
		}
		variable_set('language_default', $default);
	}
	$form_state['redirect'] = 'admin/config/regional/language';
	return;
}

/**
 * User interface for the language deletion confirmation screen.
 */
function locale_languages_delete_form($form, &$form_state, $langcode) {

	// Do not allow deletion of English locale.
	if ($langcode == 'en') {
		drupal_set_message(t('The English language cannot be deleted.'));
		drupal_goto('admin/config/regional/language');
	}

	if (language_default('language') == $langcode) {
		drupal_set_message(t('The default language cannot be deleted.'));
		drupal_goto('admin/config/regional/language');
	}

	// For other languages, warn user that data loss is ahead.
	$languages = language_list();

	if (!isset($languages[$langcode])) {
		drupal_not_found();
		drupal_exit();
	}
	else {
		$form['langcode'] = array('#type' => 'value', '#value' => $langcode);
		return confirm_form($form, t('Are you sure you want to delete the language %name?', array('%name' => t($languages[$langcode]->name))), 'admin/config/regional/language', t('Deleting a language will remove all interface translations associated with it, and posts in this language will be set to be language neutral. This action cannot be undone.'), t('Delete'), t('Cancel'));
	}
}

/**
 * Process language deletion submissions.
 */
function locale_languages_delete_form_submit($form, &$form_state) {
	$languages = language_list();
	if (isset($languages[$form_state['values']['langcode']])) {
		// Remove translations first.
		db_delete('locales_target')
		->condition('language', $form_state['values']['langcode'])
		->execute();
		cache_clear_all('locale:' . $form_state['values']['langcode'], 'cache');
		// With no translations, this removes existing JavaScript translations file.
		_locale_rebuild_js($form_state['values']['langcode']);
		// Remove the language.
		db_delete('languages')
		->condition('language', $form_state['values']['langcode'])
		->execute();
		db_update('node')
		->fields(array('language' => ''))
		->condition('language', $form_state['values']['langcode'])
		->execute();
		if ($languages[$form_state['values']['langcode']]->enabled) {
			variable_set('language_count', variable_get('language_count', 1) - 1);
		}
		module_invoke_all('multilingual_settings_changed');
		$variables = array('%locale' => $languages[$form_state['values']['langcode']]->name);
		drupal_set_message(t('The language %locale has been removed.', $variables));
		watchdog('locale', 'The language %locale has been removed.', $variables);
	}

	// Changing the language settings impacts the interface:
	cache_clear_all('*', 'cache_page', TRUE);

	$form_state['redirect'] = 'admin/config/regional/language';
	return;
}

/**
 * Setting for language negotiation options
 */
function locale_languages_configure_form() {
	include_once DRUPAL_ROOT . '/includes/language.inc';

	$form = array(
			'#submit' => array('locale_languages_configure_form_submit'),
			'#theme' => 'locale_languages_configure_form',
			'#language_types' => language_types_configurable(FALSE),
			'#language_types_info' => language_types_info(),
			'#language_providers' => language_negotiation_info(),
	);

	foreach ($form['#language_types'] as $type) {
		_locale_languages_configure_form_language_table($form, $type);
	}

	$form['actions'] = array('#type' => 'actions');
	$form['actions']['submit'] = array(
			'#type' => 'submit',
			'#value' => t('Save settings'),
	);

	return $form;
}

/**
 * Helper function to build a language provider table.
 */
function _locale_languages_configure_form_language_table(&$form, $type) {
	$info = $form['#language_types_info'][$type];

	$table_form = array(
			'#title' => t('@type language detection', array('@type' => $info['name'])),
			'#tree' => TRUE,
			'#description' => $info['description'],
			'#language_providers' => array(),
			'#show_operations' => FALSE,
			'weight' => array('#tree' => TRUE),
			'enabled' => array('#tree' => TRUE),
	);

	$language_providers = $form['#language_providers'];
	$enabled_providers = variable_get("language_negotiation_$type", array());
	$providers_weight = variable_get("locale_language_providers_weight_$type", array());

	// Add missing data to the providers lists.
	foreach ($language_providers as $id => $provider) {
		if (!isset($providers_weight[$id])) {
			$providers_weight[$id] = language_provider_weight($provider);
		}
	}

	// Order providers list by weight.
	asort($providers_weight);

	foreach ($providers_weight as $id => $weight) {
		// A language provider might be no more available if the defining module has
		// been disabled after the last configuration saving.
		if (!isset($language_providers[$id])) {
			continue;
		}

		$enabled = isset($enabled_providers[$id]);
		$provider = $language_providers[$id];

		// List the provider only if the current type is defined in its 'types' key.
		// If it is not defined default to all the configurable language types.
		$types = array_flip(isset($provider['types']) ? $provider['types'] : $form['#language_types']);

		if (isset($types[$type])) {
			$table_form['#language_providers'][$id] = $provider;

			$table_form['weight'][$id] = array(
					'#type' => 'weight',
					'#title' => t('Weight for @title', array('@title' => $provider['name'])),
					'#title_display' => 'invisible',
					'#default_value' => $weight,
					'#attributes' => array('class' => array("language-provider-weight-$type")),
			);

			$table_form['title'][$id] = array('#markup' => check_plain($provider['name']));

			$table_form['enabled'][$id] = array(
					'#type' => 'checkbox',
					'#title' => t('@title language provider', array('@title' => $provider['name'])),
					'#title_display' => 'invisible',
					'#default_value' => $enabled,
			);
			if ($id === LANGUAGE_NEGOTIATION_DEFAULT) {
				$table_form['enabled'][$id]['#default_value'] = TRUE;
				$table_form['enabled'][$id]['#attributes'] = array('disabled' => 'disabled');
			}

			$table_form['description'][$id] = array('#markup' => filter_xss_admin($provider['description']));

			$config_op = array();
			if (isset($provider['config'])) {
				$config_op = array('#type' => 'link', '#title' => t('Configure'), '#href' => $provider['config']);
				// If there is at least one operation enabled show the operation column.
				$table_form['#show_operations'] = TRUE;
			}
			$table_form['operation'][$id] = $config_op;
		}
	}

	$form[$type] = $table_form;
}

/**
 * Returns HTML for a language configuration form.
 *
 * @param $variables
 *   An associative array containing:
 *   - form: A render element representing the form.
 *
 * @ingroup themeable
 */
function theme_locale_languages_configure_form($variables) {
	$form = $variables['form'];
	$output = '';

	foreach ($form['#language_types'] as $type) {
		$rows = array();
		$info = $form['#language_types_info'][$type];
		$title = '<label>' . $form[$type]['#title'] . '</label>';
		$description = '<div class="description">' . $form[$type]['#description'] . '</div>';

		foreach ($form[$type]['title'] as $id => $element) {
			// Do not take form control structures.
			if (is_array($element) && element_child($id)) {
				$row = array(
						'data' => array(
								'<strong>' . drupal_render($form[$type]['title'][$id]) . '</strong>',
								drupal_render($form[$type]['description'][$id]),
								drupal_render($form[$type]['enabled'][$id]),
								drupal_render($form[$type]['weight'][$id]),
						),
						'class' => array('draggable'),
				);
				if ($form[$type]['#show_operations']) {
					$row['data'][] = drupal_render($form[$type]['operation'][$id]);
				}
				$rows[] = $row;
			}
		}

		$header = array(
				array('data' => t('Detection method')),
				array('data' => t('Description')),
				array('data' => t('Enabled')),
				array('data' => t('Weight')),
		);

		// If there is at least one operation enabled show the operation column.
		if ($form[$type]['#show_operations']) {
			$header[] = array('data' => t('Operations'));
		}

		$variables = array(
				'header' => $header,
				'rows' => $rows,
				'attributes' => array('id' => "language-negotiation-providers-$type"),
		);
		$table  = theme('table', $variables);
		$table .= drupal_render_children($form[$type]);

		drupal_add_tabledrag("language-negotiation-providers-$type", 'order', 'sibling', "language-provider-weight-$type");

		$output .= '<div class="form-item">' . $title . $description . $table . '</div>';
	}

	$output .= drupal_render_children($form);
	return $output;
}

/**
 * Submit handler for language negotiation settings.
 */
function locale_languages_configure_form_submit($form, &$form_state) {
	$configurable_types = $form['#language_types'];

	foreach ($configurable_types as $type) {
		$negotiation = array();
		$enabled_providers = $form_state['values'][$type]['enabled'];
		$enabled_providers[LANGUAGE_NEGOTIATION_DEFAULT] = TRUE;
		$providers_weight = $form_state['values'][$type]['weight'];

		foreach ($providers_weight as $id => $weight) {
			if ($enabled_providers[$id]) {
				$provider = $form[$type]['#language_providers'][$id];
				$provider['weight'] = $weight;
				$negotiation[$id] = $provider;
			}
		}

		language_negotiation_set($type, $negotiation);
		variable_set("locale_language_providers_weight_$type", $providers_weight);
	}

	// Update non-configurable language types and the related language negotiation
	// configuration.
	language_types_set();

	$form_state['redirect'] = 'admin/config/regional/language/configure';
	drupal_set_message(t('Language negotiation configuration saved.'));
}

/**
 * The URL language provider configuration form.
 */
function locale_language_providers_url_form($form, &$form_state) {
	$form['locale_language_negotiation_url_part'] = array(
			'#title' => t('Part of the URL that determines language'),
			'#type' => 'radios',
			'#options' => array(
					LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX => t('Path prefix'),
					LOCALE_LANGUAGE_NEGOTIATION_URL_DOMAIN => t('Domain'),
			),
			'#default_value' => variable_get('locale_language_negotiation_url_part', LOCALE_LANGUAGE_NEGOTIATION_URL_PREFIX),
			'#description' => t('<em>Path prefix</em>: URLs like http://example.com/de/contact set language to German (de). <em>Domain</em>: URLs like http://de.example.com/contact set the language to German. <strong>Warning: Changing this setting may break incoming URLs. Use with caution on a production site.</strong>'),
	);

	$form_state['redirect'] = 'admin/config/regional/language/configure';

	return system_settings_form($form);
}

/**
 * The URL language provider configuration form.
 */
function locale_language_providers_session_form($form, &$form_state) {
	$form['locale_language_negotiation_session_param'] = array(
			'#title' => t('Request/session parameter'),
			'#type' => 'textfield',
			'#default_value' => variable_get('locale_language_negotiation_session_param', 'language'),
			'#description' => t('Name of the request/session parameter used to determine the desired language.'),
	);

	$form_state['redirect'] = 'admin/config/regional/language/configure';

	return system_settings_form($form);
}

/**
 * @} End of "locale-language-administration"
 */

/**
 * @defgroup locale-translate-administration-screens Translation administration screens
 * @{
 * Screens for translation administration.
 *
 * These functions provide various screens as administration interface
 * to import, export and view translations.
 */

/**
 * Overview screen for translations.
 */
function locale_translate_overview_screen() {
	drupal_static_reset('language_list');
	$languages = language_list('language');
	$groups = module_invoke_all('locale', 'groups');

	// Build headers with all groups in order.
	$headers = array_merge(array(t('Language')), array_values($groups));

	// Collect summaries of all source strings in all groups.
	$sums = db_query("SELECT COUNT(*) AS strings, textgroup FROM {locales_source} GROUP BY textgroup");
	$groupsums = array();
	foreach ($sums as $group) {
		$groupsums[$group->textgroup] = $group->strings;
	}

	// Set up overview table with default values, ensuring common order for values.
	$rows = array();
	foreach ($languages as $langcode => $language) {
		$rows[$langcode] = array('name' => ($langcode == 'en' ? t('English (built-in)') : t($language->name)));
		foreach ($groups as $group => $name) {
			$rows[$langcode][$group] = ($langcode == 'en' ? t('n/a') : '0/' . (isset($groupsums[$group]) ? $groupsums[$group] : 0) . ' (0%)');
		}
	}

	// Languages with at least one record in the locale table.
	$translations = db_query("SELECT COUNT(*) AS translation, t.language, s.textgroup FROM {locales_source} s INNER JOIN {locales_target} t ON s.lid = t.lid GROUP BY textgroup, language");
	foreach ($translations as $data) {
		$ratio = (!empty($groupsums[$data->textgroup]) && $data->translation > 0) ? round(($data->translation/$groupsums[$data->textgroup]) * 100.0, 2) : 0;
		$rows[$data->language][$data->textgroup] = $data->translation . '/' . $groupsums[$data->textgroup] . " ($ratio%)";
	}

	return theme('table', array('header' => $headers, 'rows' => $rows));
}

/**
 * String search screen.
 */
function locale_translate_seek_screen() {
	// Add CSS.
	drupal_add_css(drupal_get_path('module', 'locale') . '/locale.css');

	$elements = drupal_get_form('locale_translation_filter_form');
	$output = drupal_render($elements);
	$output .= _locale_translate_seek();
	return $output;
}

/**
 * List locale translation filters that can be applied.
 */
function locale_translation_filters() {
	$filters = array();

	// Get all languages, except English
	drupal_static_reset('language_list');
	$languages = locale_language_list('name');
	unset($languages['en']);

	$filters['string'] = array(
			'title' => t('String contains'),
			'description' => t('Leave blank to show all strings. The search is case sensitive.'),
	);

	$filters['language'] = array(
			'title' => t('Language'),
			'options' => array_merge(array('all' => t('All languages'), 'en' => t('English (provided by Drupal)')), $languages),
	);

	$filters['translation'] = array(
			'title' => t('Search in'),
			'options' => array('all' => t('Both translated and untranslated strings'), 'translated' => t('Only translated strings'), 'untranslated' => t('Only untranslated strings')),
	);

	$groups = module_invoke_all('locale', 'groups');
	$filters['group'] = array(
			'title' => t('Limit search to'),
			'options' => array_merge(array('all' => t('All text groups')), $groups),
	);

	return $filters;
}

/**
 * Return form for locale translation filters.
 *
 * @ingroup forms
 */
function locale_translation_filter_form() {
	$filters = locale_translation_filters();

	$form['filters'] = array(
			'#type' => 'fieldset',
			'#title' => t('Filter translatable strings'),
			'#collapsible' => TRUE,
			'#collapsed' => FALSE,
	);
	foreach ($filters as $key => $filter) {
		// Special case for 'string' filter.
		if ($key == 'string') {
			$form['filters']['status']['string'] = array(
					'#type' => 'textfield',
					'#title' => $filter['title'],
					'#description' => $filter['description'],
			);
		}
		else {
			$form['filters']['status'][$key] = array(
					'#title' => $filter['title'],
					'#type' => 'select',
					'#empty_value' => 'all',
					'#empty_option' => $filter['options']['all'],
					'#size' => 0,
					'#options' => $filter['options'],
			);
		}
		if (!empty($_SESSION['locale_translation_filter'][$key])) {
			$form['filters']['status'][$key]['#default_value'] = $_SESSION['locale_translation_filter'][$key];
		}
	}

	$form['filters']['actions'] = array(
			'#type' => 'actions',
			'#attributes' => array('class' => array('container-inline')),
	);
	$form['filters']['actions']['submit'] = array(
			'#type' => 'submit',
			'#value' => t('Filter'),
	);
	if (!empty($_SESSION['locale_translation_filter'])) {
		$form['filters']['actions']['reset'] = array(
				'#type' => 'submit',
				'#value' => t('Reset')
		);
	}

	return $form;
}

/**
 * Validate result from locale translation filter form.
 */
function locale_translation_filter_form_validate($form, &$form_state) {
	if ($form_state['values']['op'] == t('Filter') && empty($form_state['values']['language']) && empty($form_state['values']['group'])) {
		form_set_error('type', t('You must select something to filter by.'));
	}
}

/**
 * Process result from locale translation filter form.
 */
function locale_translation_filter_form_submit($form, &$form_state) {
	$op = $form_state['values']['op'];
	$filters = locale_translation_filters();
	switch ($op) {
		case t('Filter'):
			foreach ($filters as $name => $filter) {
				if (isset($form_state['values'][$name])) {
					$_SESSION['locale_translation_filter'][$name] = $form_state['values'][$name];
				}
			}
			break;
		case t('Reset'):
			$_SESSION['locale_translation_filter'] = array();
			break;
	}

	$form_state['redirect'] = 'admin/config/regional/translate/translate';
}

/**
 * User interface for the translation import screen.
 */
function locale_translate_import_form($form) {
	// Get all languages, except English
	drupal_static_reset('language_list');
	$names = locale_language_list('name');
	unset($names['en']);

	if (!count($names)) {
		$languages = _locale_prepare_predefined_list();
		$default = key($languages);
	}
	else {
		$languages = array(
				t('Already added languages') => $names,
				t('Languages not yet added') => _locale_prepare_predefined_list()
		);
		$default = key($names);
	}

	$form['import'] = array('#type' => 'fieldset',
			'#title' => t('Import translation'),
	);
	$form['import']['file'] = array('#type' => 'file',
			'#title' => t('Language file'),
			'#size' => 50,
			'#description' => t('A Gettext Portable Object (<em>.po</em>) file.'),
	);
	$form['import']['langcode'] = array('#type' => 'select',
			'#title' => t('Import into'),
			'#options' => $languages,
			'#default_value' => $default,
			'#description' => t('Choose the language you want to add strings into. If you choose a language which is not yet set up, it will be added.'),
	);
	$form['import']['group'] = array('#type' => 'radios',
			'#title' => t('Text group'),
			'#default_value' => 'default',
			'#options' => module_invoke_all('locale', 'groups'),
			'#description' => t('Imported translations will be added to this text group.'),
	);
	$form['import']['mode'] = array('#type' => 'radios',
			'#title' => t('Mode'),
			'#default_value' => LOCALE_IMPORT_KEEP,
			'#options' => array(
					LOCALE_IMPORT_OVERWRITE => t('Strings in the uploaded file replace existing ones, new ones are added. The plural format is updated.'),
					LOCALE_IMPORT_KEEP => t('Existing strings and the plural format are kept, only new strings are added.')
			),
	);
	$form['import']['submit'] = array('#type' => 'submit', '#value' => t('Import'));

	return $form;
}

/**
 * Process the locale import form submission.
 */
function locale_translate_import_form_submit($form, &$form_state) {
	$validators = array('file_validate_extensions' => array('po'));
	// Ensure we have the file uploaded
	if ($file = file_save_upload('file', $validators)) {

		// Add language, if not yet supported
		drupal_static_reset('language_list');
		$languages = language_list('language');
		$langcode = $form_state['values']['langcode'];
		if (!isset($languages[$langcode])) {
			include_once DRUPAL_ROOT . '/includes/iso.inc';
			$predefined = _locale_get_predefined_list();
			locale_add_language($langcode);
			drupal_set_message(t('The language %language has been created.', array('%language' => t($predefined[$langcode][0]))));
		}

		// Now import strings into the language
		if ($return = _locale_import_po($file, $langcode, $form_state['values']['mode'], $form_state['values']['group']) == FALSE) {
			$variables = array('%filename' => $file->filename);
			drupal_set_message(t('The translation import of %filename failed.', $variables), 'error');
			watchdog('locale', 'The translation import of %filename failed.', $variables, WATCHDOG_ERROR);
		}
	}
	else {
		drupal_set_message(t('File to import not found.'), 'error');
		$form_state['redirect'] = 'admin/config/regional/translate/import';
		return;
	}

	$form_state['redirect'] = 'admin/config/regional/translate';
	return;
}

/**
 * User interface for the translation export screen.
 */
function locale_translate_export_screen() {
	// Get all languages, except English
	drupal_static_reset('language_list');
	$names = locale_language_list('name');
	unset($names['en']);
	$output = '';
	// Offer translation export if any language is set up.
	if (count($names)) {
		$elements = drupal_get_form('locale_translate_export_po_form', $names);
		$output = drupal_render($elements);
	}
	$elements = drupal_get_form('locale_translate_export_pot_form');
	$output .= drupal_render($elements);
	return $output;
}

/**
 * Form to export PO files for the languages provided.
 *
 * @param $names
 *   An associate array with localized language names
 */
function locale_translate_export_po_form($form, &$form_state, $names) {
	$form['export_title'] = array('#type' => 'item',
			'#title' => t('Export translation'),
	);
	$form['langcode'] = array('#type' => 'select',
			'#title' => t('Language name'),
			'#options' => $names,
			'#description' => t('Select the language to export in Gettext Portable Object (<em>.po</em>) format.'),
	);
	$form['group'] = array('#type' => 'radios',
			'#title' => t('Text group'),
			'#default_value' => 'default',
			'#options' => module_invoke_all('locale', 'groups'),
	);
	$form['actions'] = array('#type' => 'actions');
	$form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Export'));
	return $form;
}

/**
 * Translation template export form.
 */
function locale_translate_export_pot_form() {
	// Complete template export of the strings
	$form['export_title'] = array('#type' => 'item',
			'#title' => t('Export template'),
			'#description' => t('Generate a Gettext Portable Object Template (<em>.pot</em>) file with all strings from the Drupal locale database.'),
	);
	$form['group'] = array('#type' => 'radios',
			'#title' => t('Text group'),
			'#default_value' => 'default',
			'#options' => module_invoke_all('locale', 'groups'),
	);
	$form['actions'] = array('#type' => 'actions');
	$form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Export'));
	// Reuse PO export submission callback.
	$form['#submit'][] = 'locale_translate_export_po_form_submit';
	return $form;
}

/**
 * Process a translation (or template) export form submission.
 */
function locale_translate_export_po_form_submit($form, &$form_state) {
	// If template is required, language code is not given.
	$language = NULL;
	if (isset($form_state['values']['langcode'])) {
		$languages = language_list();
		$language = $languages[$form_state['values']['langcode']];
	}
	_locale_export_po($language, _locale_export_po_generate($language, _locale_export_get_strings($language, $form_state['values']['group'])));
}
/**
 * @} End of "locale-translate-administration-screens"
 */

/**
 * @defgroup locale-translate-edit-delete Translation editing/deletion interface
 * @{
 * Edit and delete translation strings.
 *
 * These functions provide the user interface to edit and delete
 * translation strings.
 */

/**
 * User interface for string editing.
 */
function locale_translate_edit_form($form, &$form_state, $lid) {
	// Fetch source string, if possible.
	$source = db_query('SELECT source, context, textgroup, location FROM {locales_source} WHERE lid = :lid', array(':lid' => $lid))->fetchObject();
	if (!$source) {
		drupal_set_message(t('String not found.'), 'error');
		drupal_goto('admin/config/regional/translate/translate');
	}

	// Add original text to the top and some values for form altering.
	$form['original'] = array(
			'#type'  => 'item',
			'#title' => t('Original text'),
			'#markup' => check_plain(wordwrap($source->source, 0)),
	);
	if (!empty($source->context)) {
		$form['context'] = array(
				'#type' => 'item',
				'#title' => t('Context'),
				'#markup' => check_plain($source->context),
		);
	}
	$form['lid'] = array(
			'#type'  => 'value',
			'#value' => $lid
	);
	$form['textgroup'] = array(
			'#type'  => 'value',
			'#value' => $source->textgroup,
	);
	$form['location'] = array(
			'#type'  => 'value',
			'#value' => $source->location
	);

	// Include default form controls with empty values for all languages.
	// This ensures that the languages are always in the same order in forms.
	$languages = language_list();
	$default = language_default();
	// We don't need the default language value, that value is in $source.
	$omit = $source->textgroup == 'default' ? 'en' : $default->language;
	unset($languages[($omit)]);
	$form['translations'] = array('#tree' => TRUE);
	// Approximate the number of rows to use in the default textarea.
	$rows = min(ceil(str_word_count($source->source) / 12), 10);
	foreach ($languages as $langcode => $language) {
		$form['translations'][$langcode] = array(
				'#type' => 'textarea',
				'#title' => t($language->name),
				'#rows' => $rows,
				'#default_value' => '',
		);
	}

	// Fetch translations and fill in default values in the form.
	$result = db_query("SELECT DISTINCT translation, language FROM {locales_target} WHERE lid = :lid AND language <> :omit", array(':lid' => $lid, ':omit' => $omit));
	foreach ($result as $translation) {
		$form['translations'][$translation->language]['#default_value'] = $translation->translation;
	}

	$form['actions'] = array('#type' => 'actions');
	$form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Save translations'));
	return $form;
}

/**
 * Validate string editing form submissions.
 */
function locale_translate_edit_form_validate($form, &$form_state) {
	// Locale string check is needed for default textgroup only.
	$safe_check_needed = $form_state['values']['textgroup'] == 'default';
	foreach ($form_state['values']['translations'] as $key => $value) {
		if ($safe_check_needed && !locale_string_is_safe($value)) {
			form_set_error('translations', t('The submitted string contains disallowed HTML: %string', array('%string' => $value)));
			watchdog('locale', 'Attempted submission of a translation string with disallowed HTML: %string', array('%string' => $value), WATCHDOG_WARNING);
		}
	}
}

/**
 * Process string editing form submissions.
 *
 * Saves all translations of one string submitted from a form.
 */
function locale_translate_edit_form_submit($form, &$form_state) {
	$lid = $form_state['values']['lid'];
	foreach ($form_state['values']['translations'] as $key => $value) {
		$translation = db_query("SELECT translation FROM {locales_target} WHERE lid = :lid AND language = :language", array(':lid' => $lid, ':language' => $key))->fetchField();
		if (!empty($value)) {
			// Only update or insert if we have a value to use.
			if (!empty($translation)) {
				db_update('locales_target')
				->fields(array(
						'translation' => $value,
				))
				->condition('lid', $lid)
				->condition('language', $key)
				->execute();
			}
			else {
				db_insert('locales_target')
				->fields(array(
						'lid' => $lid,
						'translation' => $value,
						'language' => $key,
				))
				->execute();
			}
		}
		elseif (!empty($translation)) {
			// Empty translation entered: remove existing entry from database.
			db_delete('locales_target')
			->condition('lid', $lid)
			->condition('language', $key)
			->execute();
		}

		// Force JavaScript translation file recreation for this language.
		_locale_invalidate_js($key);
	}

	drupal_set_message(t('The string has been saved.'));

	// Clear locale cache.
	_locale_invalidate_js();
	cache_clear_all('locale:', 'cache', TRUE);

	$form_state['redirect'] = 'admin/config/regional/translate/translate';
	return;
}

/**
 * String deletion confirmation page.
 */
function locale_translate_delete_page($lid) {
	if ($source = db_query('SELECT lid, source FROM {locales_source} WHERE lid = :lid', array(':lid' => $lid))->fetchObject()) {
		return drupal_get_form('locale_translate_delete_form', $source);
	}
	else {
		return drupal_not_found();
	}
}

/**
 * User interface for the string deletion confirmation screen.
 */
function locale_translate_delete_form($form, &$form_state, $source) {
	$form['lid'] = array('#type' => 'value', '#value' => $source->lid);
	return confirm_form($form, t('Are you sure you want to delete the string "%source"?', array('%source' => $source->source)), 'admin/config/regional/translate/translate', t('Deleting the string will remove all translations of this string in all languages. This action cannot be undone.'), t('Delete'), t('Cancel'));
}

/**
 * Process string deletion submissions.
 */
function locale_translate_delete_form_submit($form, &$form_state) {
	db_delete('locales_source')
	->condition('lid', $form_state['values']['lid'])
	->execute();
	db_delete('locales_target')
	->condition('lid', $form_state['values']['lid'])
	->execute();
	// Force JavaScript translation file recreation for all languages.
	_locale_invalidate_js();
	cache_clear_all('locale:', 'cache', TRUE);
	drupal_set_message(t('The string has been removed.'));
	$form_state['redirect'] = 'admin/config/regional/translate/translate';
}
/**
 * @} End of "locale-translate-edit-delete"
 */

/**
 * Returns HTML for a locale date format form.
 *
 * @param $variables
 *   An associative array containing:
 *   - form: A render element representing the form.
 *
 * @ingroup themeable
 */
function theme_locale_date_format_form($variables) {
	$form = $variables['form'];
	$header = array(
			t('Date type'),
			t('Format'),
	);

	foreach (element_children($form['date_formats']) as $key) {
		$row = array();
		$row[] = $form['date_formats'][$key]['#title'];
		unset($form['date_formats'][$key]['#title']);
		$row[] = array('data' => drupal_render($form['date_formats'][$key]));
		$rows[] = $row;
	}

	$output = drupal_render($form['language']);
	$output .= theme('table', array('header' => $header, 'rows' => $rows));
	$output .= drupal_render_children($form);

	return $output;
}

/**
 * Display edit date format links for each language.
 */
function locale_date_format_language_overview_page() {
	$header = array(
			t('Language'),
			array('data' => t('Operations'), 'colspan' => '2'),
	);

	// Get list of languages.
	$languages = locale_language_list('native');

	foreach ($languages as $langcode => $info) {
		$row = array();
		$row[] = $languages[$langcode];
		$row[] = l(t('edit'), 'admin/config/regional/date-time/locale/' . $langcode . '/edit');
		$row[] = l(t('reset'), 'admin/config/regional/date-time/locale/' . $langcode . '/reset');
		$rows[] = $row;
	}

	return theme('table', array('header' => $header, 'rows' => $rows));
}

/**
 * Provide date localization configuration options to users.
 */
function locale_date_format_form($form, &$form_state, $langcode) {
	$languages = locale_language_list('native');
	$language_name = $languages[$langcode];

	// Display the current language name.
	$form['language'] = array(
			'#type' => 'item',
			'#title' => t('Language'),
			'#markup' => check_plain($language_name),
			'#weight' => -10,
	);
	$form['langcode'] = array(
			'#type' => 'value',
			'#value' => $langcode,
	);

	// Get list of date format types.
	$types = system_get_date_types();

	// Get list of available formats.
	$formats = system_get_date_formats();
	$choices = array();
	foreach ($formats as $type => $list) {
		foreach ($list as $f => $format) {
			$choices[$f] = format_date(REQUEST_TIME, 'custom', $f);
		}
	}
	reset($formats);

	// Get configured formats for each language.
	$locale_formats = system_date_format_locale($langcode);
	// Display a form field for each format type.
	foreach ($types as $type => $type_info) {
		if (!empty($locale_formats) && in_array($type, array_keys($locale_formats))) {
			$default = $locale_formats[$type];
		}
		else {
			$default = variable_get('date_format_' . $type, key($formats));
		}

		// Show date format select list.
		$form['date_formats']['date_format_' . $type] = array(
				'#type' => 'select',
				'#title' => check_plain($type_info['title']),
				'#attributes' => array('class' => array('date-format')),
				'#default_value' => (isset($choices[$default]) ? $default : 'custom'),
				'#options' => $choices,
		);
	}

	$form['actions'] = array('#type' => 'actions');
	$form['actions']['submit'] = array(
			'#type' => 'submit',
			'#value' => t('Save configuration'),
	);

	return $form;
}

/**
 * Submit handler for configuring localized date formats on the locale_date_format_form.
 */
function locale_date_format_form_submit($form, &$form_state) {
	include_once DRUPAL_ROOT . '/includes/locale.inc';
	$langcode = $form_state['values']['langcode'];

	// Get list of date format types.
	$types = system_get_date_types();
	foreach ($types as $type => $type_info) {
		$format = $form_state['values']['date_format_' . $type];
		if ($format == 'custom') {
			$format = $form_state['values']['date_format_' . $type . '_custom'];
		}
		locale_date_format_save($langcode, $type, $format);
	}
	drupal_set_message(t('Configuration saved.'));
	$form_state['redirect'] = 'admin/config/regional/date-time/locale';
}

/**
 * Reset locale specific date formats to the global defaults.
 *
 * @param $langcode
 *   Language code, e.g. 'en'.
 */
function locale_date_format_reset_form($form, &$form_state, $langcode) {
	$form['langcode'] = array('#type' => 'value', '#value' => $langcode);
	$languages = language_list();
	return confirm_form($form,
			t('Are you sure you want to reset the date formats for %language to the global defaults?', array('%language' => $languages[$langcode]->name)),
			'admin/config/regional/date-time/locale',
			t('Resetting will remove all localized date formats for this language. This action cannot be undone.'),
			t('Reset'), t('Cancel'));
}

/**
 * Reset date formats for a specific language to global defaults.
 */
function locale_date_format_reset_form_submit($form, &$form_state) {
	db_delete('date_format_locale')
	->condition('language', $form_state['values']['langcode'])
	->execute();
	$form_state['redirect'] = 'admin/config/regional/date-time/locale';
}
